Dental-material-condensing apparatus.



ran srarns ra'rnnr orrion JEPTI-IA e. oLLmsswoa'rrr, or Kansas CITY,MISSOURI.

To all whom it may concern:

Belt known that I, JEPTHA GLHOLLINGS- wonrrr, a citizen of the UnitedStates, residing atKansa-s City in thecounty of Jackson I and State ofMissouri, have invented certain new and useful Improvements in Dental-Material-Condensing Apparatus, of which the followingis a specification.

This invention relates to dental material condensing apparatus and moreparticularly I to apparatus for condensing material in molds to formfillings to be transferred to and cemented in tooth cavitiescorresponding to such molds, a method and apparatus for the preparationof such fillings being illustrated and described in patents numbered anddated respectively 1,099,248, June 9, 191i, and1,10l,439, June 23, 191i.

, Prior to the invention forming the subject matter of this applicationthe filling mate rial has been condensed hand tamping or pressur and Ihave foundthat such method is very fatiguing to the operator particu-vlarly in making cold gold fillings where a forcible tamping pressure isrequired to re duce the gold to a homogeneous mass.

My object therefore is toproduce appa ratus for condensing cold goldfillings and the like with greater facility, ease, and efliciency thaln"by the 'inethod heretofore e1n- With this general object ventlon'consists of certain novel'and pecul iar features of constructlon andorganizat on ashe'reinafter' described and claimed; and

iii-order that it may befully understood reference is to be had to theaccompanying drawing, in whichtaken ont'he dottedline I I of Fig. 1. IFig.

mold having an undercut portion. isa fragmentary vertical sectionshowing an is a section of a block for use when it is desired tocondense or tamp a filling into a Fig. 1,

adjustable means for suspending the tamping orcompressing tool orimplement.

"Inthe said drawing where like reference characters identifycorresponding partsin all thefigures, 11s a hollow base provided with anopening 2, in its top and a standard 3, which term nates in an arm 4,overhang ingilthe openingfz. In Fig. 1, the arm a 18 in view, the inby across-piece 19.

I Specification of Letters Fatent. PatentgflJgfiplsplgl.

Application filed January 7, i915. Serial N0."1,024.

provided with a socket 5,' at its underside,

and secured to the lower side of said arm is a spring plate 6,bifurcated at 7, at its'free end. p

8 indicates one'form of pressing or tamp ing tool for attachment to thelower end of a handle portion 9; equipped with a headed shank 10, at itsupperend, and tosupport the tool or implement; the narrow part of 7guide flanges 15. Connecting said plate to a cross-piece 15 of the base,which rests'upon a table T, or the like, is a retractile spring 16, foreffecting a rapid lowering of the plate after each upward movementimparted to the same, in a manner hereinafter explained.

- A transverse rockshaft 17; is journaledin the side walls of the base1, and is provided within the latter with a pair of upwardly andforwardly extending arms 18, connected A rock-frame'consisting of apairof parallel upwardly and rearwardly extending arms 20, overlying thecross-piece 19, and fitting between the arms 18, and mounted upon arock-shaft 21,;at their front ends. The rock-shaft is journaled in theside walls of the base, and the free or rear ends of the arms 20, areconnected by across-piece A lever 23, for rocking shaft 17, is arrangedwithin the base and extends rearwardly from the shaft 21. It isconnected at its rear endby a chain orequivalent connection 2% to afootlever 25 hinged 2113,26 below the table and provided witha rubberfoot piece 27. To avoid a chattering noise in the operation of the footlever, a cushion 28 is interposed between the top of the base and thelever 23 and a cushion. 29 is' i'nterposed between the lever and thetable. p The deviceis operated by the attendant placinghis foot'uponplate 27 and alter-" nately applying and relaxing pressure thereon, thedepression of the lever imparting a she-rt upward movement to the liftplate and the removal of the pressure from the lever permitting theparts to be returned instantly through the retraction of spring 16,which is tensioned by the upward movement. It will thus be seen thatvertical vibratory movement of the plate 14 can be produced and that thespeed and force of such movement is entirely under the control of theoperator.

The lift frame forms a support for a pedestal or block 30, provided withupwardly projecting lugs 31. A mold 32 containing a cavity not shown,corresponding to the cavity in the tooth to be filled, is placed uponthe pedestal and the mold is provided with a groove 33 to receive thelug 31, whereby turning movement or accidental dislodgment of the mold,is prevented. The pedestal is held lightly vertically below the tool andwith each upward movement of the lift plate gold or other fillingmaterial placed in the cavity is tamped through impact against the lowerend of the tool, it being obvious that the operator can shift theposition of the pedestal slightly after each impact so that the entiresurface of the filling material may be brought into contact with thetool, and it is also obvious that the operator by maintaining pressureupon the foot lever can maintain the lift plate in an elevated positionand shift the pedestal upon the lifting plate so as to get in effect aheavy burnishing action on the filling material through theinstrumentality of the tool. He can thus follow the irregular contour ofthe cavity and condense the marginal portion of the filling moreeffectively than by the tamping action.

With cavities which extend at an angle to the perpendicular there ispresented an undercut surface as shown at S, Fig. 3, and to tampmaterial along this surface efficiently I have found it desirable toprovide a false base to support the pedestal at such an angle that theundercut side of the cavity shall occupy a substantially verticalposition. I This base is numbered 34: and adapted to rest directly uponthe lift plate 14 and to be shifted thereon by hand and carry thepedestal and mold with it. To retain the pedestal properly in positionits upper side is provided with a recess or channel 35 within which thebase rests and is capable of rotation, should it be desired to rotatethe mold with respect to the tool as in burnishing operations, though itis obvious that a'burnishing action can be obtained by moving the falsebase upon the lift plate.

. Provision hasbeen made for the vertical adjustment of the tampingdevice or tool,

Fig. 4, where a screw 36 is mounted in arm t and is provided at its.lower end with a socket 37 corresponding to socket 5 and like the latteradapted for the reception of the headed end of the shank 10, and toreliably support the tool a U-shaped spring 38 is secured to the screwand has its lower arm underlying the screw and bifurcated at 39 for thereception of the shank of the tool.

It will be apparent that with an apparatus of the character outlined,the hands of the operator are left free except as he must shift the moldwith its supporting parts to bring the tamping tool in contact with theentire surface of the filling in the mold. Consequently the operationcan be performed without the fatigue incident to performing the tampingoperation by hand. Of course a motor or its equivalent may be employedfor imparting vibratory action to the lift plate, but it isbelieved theoperation of the same manually is more satisfactory, in that practicewill soon enable the operator to apply the force most suitable for theparticular work on hand. Furthermore a manually operated apparatus isessential in small towns or places where other power is unavailable. 7 I

From the above description it will be apparent that I have produced -adental material condensing apparatus embodying the features of advantageenumerated as desirable, and I wish it to be understood that while Ihave illustrated and described what now appears to be the preferred formof the invention, I reserve the right to make all changes falling withinthe spirit and scope of the appended claims;

I claim:

1. A dental material condensing apparatus, comprising a suitablysupported tool, a plate for the support of a mold, and means foreffecting relative rapid vibratory appreaching movement between the tooland plate whereby filling material in the mold may be tamped therein bythe said tool.

2. A dental material condensing apparatus, comprising a suitablysupported tool, a plate for the support of a mold, means for effectingrelative rapid approaching movement between the tool and plate wherebyfilling material in the mold may be tamped therein by said tool, andyielding means for quickly effecting reverse movement between said tooland plate. 7 V

3. A dental material condensing apparatus, comprising a suitablysupported tool, means for supporting a mold in longitudinal alinementand in a tilted position with respect to the tool, and means foreffecting relative rapid vibratory approaching movement between the tooland mold-holding means whereby filling material in the mold maybe tampedtherein by said tool.

4. A dental material condensing appa',

ratus, comprising a suitably supported tool, a plate provided with acircular recess in its upper side for the support of amold tool so thatthe latter shall be capable of rotatable adjustment, and means forefiecting relative rapid vibratory movement be tween the tool and platewhereby filling material in the mold may be tamped therein by the tool.

5. A dental material condensing apparatus, comprising a pendantlysupported tool, a base provided with an opening underlying said tool, aplate forup and down sliding movement in saidopening and for the supportof a mold containing material to be tamped, toot-lever actuated meansfor effecting quick upward movement of the plate in said opening, and aspring for reversing such movement.

6. A dental material condensing apparatus, comprising a pendantlysupported tool, a base provided with an opening underlying said tool, aplate for up and down sliding movement in said opening, a pedestalresting on said plate, a mold secured on said pedestal vertically underthe tool, crossed devices pivotally carried within the base at theirlower ends and engaging said plate at their upper ends, a cross piecesecured to one of said devices and engaging the under side of the otherof said devices, a spring holding the plate yieldingly depressed, andlever actuated means for imments between the plate and tool whereby thefilling material may be tamped within the mold.

8. In a dental material condensing apparatus, a base provided withaanopening and a standard, the latter terminating at itsupper end overthe'opening, a plate fitting in the opening for the support of a mold,containing material to be condensed, a tool detachably suspendedvertically from the standard over said opening, means carried by thestandard and engaging the tool to assist in holding the latter againstswinging movement, and means for imparting rapid vibratory movement tothe plate toward and from the tool.

In testimony whereof I afliX my signature in the presence of twoWitnesses.

JEPTHA G. HOLLINGSVVORTH. Witnesses:

H. C. Ronenns, G. Y. THORPE.

Copies of. this patent may be obtained for five cents each, byaddressing the Commissioner of Patents,

Washington, D. G.

